Pith Number

pith:XEVBJRKZ

pith:2012:XEVBJRKZU6YDI5VJU3H5DF6XDA

not attested not anchored not stored refs pending

Verification Condition Generation and Variable Conditions in Smallfoot

Cristiano Calcagno, Josh Berdine, Peter W. O'Hearn

arxiv:1204.4804 v1 · 2012-04-21 · cs.LO · cs.PL

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XEVBJRKZU6YDI5VJU3H5DF6XDA}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T03:57:15.341725Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b92a14c559a7b03476a9a6cfd197d7182a1ca4d7c848c482c28f4dfe23f321dd

Aliases

arxiv: 1204.4804 · arxiv_version: 1204.4804v1 · doi: 10.48550/arxiv.1204.4804 · pith_short_12: XEVBJRKZU6YD · pith_short_16: XEVBJRKZU6YDI5VJ · pith_short_8: XEVBJRKZ

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/XEVBJRKZU6YDI5VJU3H5DF6XDA \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: b92a14c559a7b03476a9a6cfd197d7182a1ca4d7c848c482c28f4dfe23f321dd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dcb46cb1b41882d413998347469b08d74a86a1534c0ffa59486df0708990f5b0",
    "cross_cats_sorted": [
      "cs.PL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2012-04-21T11:46:38Z",
    "title_canon_sha256": "7f7b796bed11c5fb53eadca808f2da950a775620c3c34cf397dabf4151df6cf2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1204.4804",
    "kind": "arxiv",
    "version": 1
  }
}